<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			#p1{font-weight: 100;}
			#p2{font-weight: 400;}
			#p3{font-weight: 700;}
			#p4{font-weight: 900;}
		</style>
	</head>
	<body>
	<p id="p1">字体粗细为:100(lighter)</p>
	    <p id="p2">字体粗细为:400(normal)</p>
	    <p id="p3">字体粗细为:700(bold)</p>
	    <p id="p4">字体粗细为:900(bolder)</p>
	</body>
</html>